Lake Sammamish Half Marathon
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Brooks Lake Sammamish Half Marathon presented by REI
The Brooks Lake Sammamish Half Marathon presented by REI is a USATF certified half marathon (certification WA25004RMB) held on March 7, 2026. The race is a point to point route that follows the smooth interurban trail from the Marymoor Park / Redmond City Hall area to the finish at Lake Sammamish State Park soccer fields in Issaquah. The course includes paved and smooth gravel sections and is described as flat and fast.
Aid stations are located approximately every 2 to 3 miles and are stocked with water, gels, and endurance fuel. The event is cupless; runners should bring a handheld bottle or a hydration pack, or use a reusable cup supplied at the start. Pacers are provided by a local running group for a range of target finish times.
All in person participants receive a Brooks Podium tech shirt, a custom bib, and a finisher medal. Free gear check is available; participants are asked to bring their own bag. The race provides heated shuttles from the finish back to the start area. Awards are given to the top three overall men, women, and non binary finishers by gun time, and age group awards are given in five year increments and must be picked up at the race.
Registration follows Orca Running policies: entries are non refundable, with options to defer or transfer according to race policy. A virtual half marathon option is also offered with mailed swag and a limited number of spots. Visit the organization's website for the most recent information.
